Electromagnetic recording mechanism



June 22, 1943. E. E. TURNER, JR

ELECTROMAGNETIC RECORDING MECHANISM 2 Sheets-Sheet 1 Original Filed Oct.2, 1937 INVENT OR.

June 22, 1943. E. E. TURNER, JR 2,322,253

ELECTROMAGNETIC RECORDING MECHANISM Original Filed Oct. 2, 1957 2Sheets-Sheet 2 30 5/ 29 I I y 'T INVENTOR .latentedjJuncglm v umrao-s'mras PATENT 7 OFFICE "nmc'raomcnnrrc RECORDING MECHANISM Edwin 'E.Turner, Jr., West Roxbury, Masa. as-

signor to Submarine 'SiInal Company. Boston,

.. a corporation of Maine Original application October 2, 1937, SerialNo.

166,960. Divided and this application December 21, 1940, Serial No.371,084

2 Claims.

The present application is a division 01' my copending applicationSerial No. 166,960, filed October 2, 1937, now Patent No.2,250,509,'issued July 29, 1941.

The present invention relates to a recording mechanism for producing apermanent record on a paper by means of a marking element.

The present invention is more particularly directedto recording themeasurement of'shorttime intervals such as the time interval between Asindicated in the drawings a paper 4, which.

maybe ruled off as shown in Fig. 2 with vertical and horizontal lines,the horizontal lines being marked to indicate the depth, while thevertical lines indicate the actualtime at which the record 'was madeprovided that the paper is moved at uniform speed and related in itscalibrations to some time mechanism as, for instance, a clock thesending out of asignal in acoustic depth measurement and the receipt ofan echo reflected from a distant object or a sea bottom wherein not onlythe time intervallitself ,isvery short,

nals, the measure of distance or depth is marked upon a chart of paperor other suitable material, preferably by ink, to indicate the distanceor depth measured. In the system of the present invention the signal istransmitted at very frequent intervals, in fact intervals at suchfrequency that the recorded echo' produces marks successively closeenough together to form a continuous line. In this system it followsfrom certain of these relationships that the recording paper movesslowly in comparison with the element which makes the mark.

In accomplishing the results in the present case theapplicant hasemployed a helical blade in combination with a marking bar workingrespectively on opposite sides of the marking paper to produce a mark onthe paper. The paper moves slowly between the blade and bar, the formerbeing suitably inked so that as the bar which is thrust against thepaper by the action of the incoming signal is operated, a mark isproduced. The helical blade is. preferably so designed that a straightline record transverse to the travel of the paper may be produced.

Further objects and advantages of the present invention in relation tothe application for which it is used and in the construction of theapparatus will be understood from the specification below and thedrawings illustrating the apparatus.

In the drawings Fig. 1 shows a side view of the apparatus with fragmentsremoved to show detailed constructions; Fig.2 shows a plan view of thearrangement shown in Fig. 1 as viewed from the bottom of Fig. 1; Fig.3jshows a section taken on the line X-X of Fig. 2; Fig. 4 shows asection taken on the line Y-Y of Fig. 2.

or synchronous motor run from an alternating current source whosefrequency is time controlled. The sheet 4 may be provided with holes 5at its edges suitably placed to receive the teeth 6' of sprocket roll 6so that the paper may be drawn by the sprocket roll over the lower faceof the drum 1 and between the timing element 0 and the marking bar 9.The paper initially is supplied in a roll ill mounted on a spindle ii inthe top corner of the plates 2 and 3 and moves as indicated by the arrowii in Fig. 3 downward under the drum 7 over the sprocket roll 8 and isrewound again upon the spindle l3 which is driven by the same drivingsource that drives the sprocket roll 6. This is indicated by the belt 2H and the pulleys i5 and ii the roll i3 is driven. The mechanism in therecorder device may for convenience in describing be divided into twoparts; first, the marking mechanism, secondly, the mechanism for feedingand controlling the movement of the paper. The marking mechanism isshown in Figs. 3 and 4 in section and in by means of which part in Figs.1 and 2.

springs 2i and 22 which hook in holes in the middle of the side pieces.The springs are helical and are hung at their other end to rods 23 and24, respectively, which are threaded to fit into the ears 25 and 26extending from the plates 2 and 1. Within the drum 1 there is carried acore 29 of a tubular shape with a hole 30 in the center. This core iswound with a coil 3i, as indicated in Figs. 3 and-4, so as to make theflux circulate as indicated by the arrow 32 in Fig. 3. The core issupported in space within the shell 'I by means of three rods 3!, .34and 35 which pass through the end plates 2 and I and to them by nuts 39and 40.

The turn including the marking bar 9 is linked with the core 29 so thatcurrent passed through the coil 3i will induce current in the singleturn l8 and cause current to how lengthwise of the bar 9. The blade 9 ispositioned in the slot ll of the shell 1. The slot I1, as stated above,is

are held in place.

a magnetic air gap formed because the shell is a permanent magnet. Theturn 18, as has been mentioned above, is supported by the springs 2| and22, the purpose of which is to allow the bar 9 free motion in adirection at right angles to the direction of the spring. Mountedopposite the edge of the bar 9 is the helical timing blade 8 which isrotated at a constantly uniform speed. The helical blade 8, as will benoted in Figs. 2 and 4, makes one complete turn. This helix, however,differs from the ordinary helix in that the back edge is cut away sothat only the edge 50 comes in contact with the paper as the high pointof the helix sweeps by the paper. With the helix rotating at a constantspeed, the high point of the edge 58 will sweep uniformly over the paperfrom the zero point to the deepest depth or calibration marked on themarking paper. As viewed in Fig. 2 this downward motion of the point oftangency of the helix and the paper is such as to produce a uniform orconstant travel.

At the time that the signal is emitted the tangency of the edge 58 ofthe'helix 8 is at zero and when the reflected echo is received and anindication produced so that the timing bar operates, the edge 50 of thhelix will be at the correct depth as calibrated or read on the paper 4.When the echo wave or signal is received it it made to impress animpulse upon the coil 3| which induces a current in the single turn I8and thereby produces a motion of fhe marking bar 9 to the left, as shownin Fig. 4. This brings the paper 4 in contact with the helical blade 8at the point of its edge where the blade is tangent to the paper, As theblade is always inked, as will be presently explained, there is producedon the paper 4 a vertical mark in the position of the paper as shown inFig. 2.

The helical blade 8 is mounted at its end in blocks 52 and 53 which areformed at the end of the shafts 54 and 55, respectively, forming as awhole a rigid rotating element with the shafts 54 and 55 aligned on thesame axis. tating system is supported in bearings 58 and 51 extendingfrom the bars or frames 58 and 59 which are adjustably mounted asindicated in Figs. 1, 2 and 3. The arms 58 and 59 have upwardlyextending ears 90 formed as a part of the arms and journaled to allowthe shaft 84 at each end to pass through the cars so that the bars 58and 59 are pivoted on the shaft 64. The bars 58 and 59 are adjusted bymeans of the adjusting screws 50. Fig. 3 shows the adjusting screw forthe bar 59 as well as its tensioning spring ii. The bar 58 has a similaradjustment. These adjustments allow the bars 58 and 59 to be slightlyraised or lowered against the tension of the springs 61 so that theproper contact may be made between the paper and the blade to allow thepoint of tangency of the blade 8 to travel across the paper as the bladeis rotated.

The inking roller 80 is slightly smaller in diameter than the helicalblade 8 but mounted in contact with it and journaled in bearings 91 and92 mounted upon the bars 58 and 59 so that relatively the blade andinking roller will always have their axes in the same position. Thediameter of the inking roller being slightly smaller than the blade, theblade will progressively con tact over different surfaces of the inkingroll and thereby consume the ink uniformly from the roll and not wear itin spots as it otherwise would.

The shaft 54 upon which the blade 8 is mounted is driven by the gear 82which, in turn, is

, driven by the gear 53 on the shaft 54, mounted Lil in bearings 65 and66 extending from the base I. The shaft 64 is driven through the spurgear HJ which may be operated by a motor or any other driving system,the only limitation being that the speed of the driving source should beso controlled as to produce the desireduniform rotation of the markingblade 8 corresponding to the calibrations on the marking paper and tothe use to which the recording device is put.

Itwill be noted that the adjustment of the helical blade 8 is on an arcconcentric with the axis of the shaft 84 which is the driving shaft forthe gear 63 so that as the gear 62 is moved with the adjustment of thearms 58 and 59 the same contact of the gears 62 and 53 will bepreserved.

The shaft 64 also drives the means for advancing the paper. This isindicated in Fig. 2. The worm B8 on the shaft 54 drives the gear 59which, in turn, drives the shaft 1!. The shaft 13 upon which the roll 6is mounted is driven through the gears 93 and 94. Also on the shaft 13is mounted the pulley l5 and a hand knob 74 so that the roll 6 may beturned by hand if necessary. The pulley i5, as has been stated above.drives through the belt l4, the spindle It for winding up the paper asit leaves the spindle 5.

It should also be noted that the gear 83 for driving the marking blad 8through the gear 62 is adjustable on the shaft 54 by means of the disc82 pinned to the shaft 84 and carrying the set screws 83 and 84 workingin the slots 85 and 85, respectively. The gear 83 may in this manner berotated the angle of the arc of the slots 85 and 86 and be set in thedesired position. In

7 this manner the respective timing position of the This roblade 8 andthe rest of the mechanism may be obtained. This is particularlynecessary where the driving gear 10 is tied in to a control system as isusually the ease to emit a sound signal at the proper time so that thescale on the marking paper as calibrated will record the proper depth.

Having now described my invention, I claim:

1.111 a recorder of the type described, the combination of a hollowcylindrical permanent magnet having an elongated airgap between itspoles, a transformer having a closed hollow cy- -lindrical coreconcentrically positioned within said magnet and having a toroidalprimary winding and a secondary winding comprising an elongated closedsingle turn flat strip of conduc tive material wound edgewise and meansfreely suspending said secondary winding with one long side thereofwithin said core and the other long side within said elongated airgapfor transverse motion therein.

2. In a recorder of the type described, the combination of an elongatedhollow magnetic cylinder having a slot along its length forming amagnetieairgap, an elongated hollow toroidal transformer core positionedwithin said cylinder, a toroidal primary winding on said core, asecondary winding linking said core and formed of a. closed,substantially rectangular, elongated loop of flat conductive materialwound edgewise and spring means supporting said secondary winding by itsshort sides and positioning one of its long sides within said core andthe other long side w thin said airgap for free transverse motiontherein.

EDWIN E. TURNER, JR.

